Grate.



l D. BOIES J. A. WADDELL, JB.

GRATE. APPLICATION FILED APR. 27, 1909.

Patented Aug. 30,v 1910.

2 SHEETS-SHEET 1.

D. BOIES & I. A. WADDELL, JR. I

GRATB. 5 APPLICATION FILED PE.Z7. 1909.

Patented' Aug. 30, 19110.

2 SHEETS-SHEET 2.

aiming@ UNITED sTATEs PATENT oEETcE DAVID I'BOIES AND JOSEPH A. WADDELL,

JR., OF SCRANTON, PENNSYLVANIA, ASSIGN- ORS T SPENCER EATER CO., OFSCRANTON, PENNSYLVANIA, A CORPORATION.

GRATE.

Specification of Letters Patent. Patented Allg. 30, 1910.

Application filed April 27, 1909. Serial No. 492,528.

' which the following is a specification.

-gener This invention relates to grates' of that al type employed byheaters disclosed in prior patents of applicants Nos. 399,443, 346,646and 348,806, and has for its purpose to provide a grate wherein the fuelis evenly distributed throughout the surface of the grate whereby a moreuniform and perfect heating of the boiler surface is effected.

l The invention is particularly applicable to inclined or ridge shapedgrates that are fed from a hopper or magazine located above andintermediate of the grate. It is, however, equally as applicable to aconical grate or to a grate wherein the feed takes place at the twoouter edges of a grate slop- 1ng toward a central line. Also it may beemployed with the grate bars extending continuously from the highest tothel lowest part of the grate or with a grate in which the grate barsare divided intermediately and 'the parts independently oscillated forthe purpose of shaking the grate. According to the present practicegrates of this type are arranged at an inclination substantiallyparallel to the natural slope as' sumed by the pile of fine coal fedupon the grate, so that a fire-bed of uniform thickness from the top tot-he bottom is produced.

The object of the present invention, and which by practicaldemonstration has proven to be highly satisfactory, to avoid shakingthrough fine coal at the apex or point of feedingv of the grate whileagitating it sufficiently to cause the coal to feed from the hopper ormagazine; and at the same time to produce the necessary agitation andgrate openings at. the lower ends of the grate bars, or at the bottom ofthe grate, to insure full discharge of the ash or spent fuel.

With these objects in view our invention is described in the course ofthe following specification,- and set. forth in the claims.-

Referring to the accompanying drawings wherein is shown the, inventionin its prefer-red structure, Figure l is a plan View of a o'rate of theridve t e and disclosino' D b b the present invention, Fig. 2 is a'transverse sectional view of the 'same taken alonvV the e line A-A,Fig. 8 is a top plan view of two grate bars disclosing the same inpartly opened position. Fig. 4 is an end elevation of two of the gratebars, Fig. 5 is asimilar A view in section taken along the line B-B ofFig. 3' and showing the manner o f operal tion, Fig. 6 is an endelevation of a single.

bar opposite to that shown in Fig. 4, Fig. 7 is a top plan viewdisclosing the applicationof the invention to a conical grate, and Fig.l8 is a bottom plan view of Fig. 7.

Referring to the several views, wherein like numerals of referenceindicate corresponding parts in the dierent views shown,

Athe invention comprises a plurality of grate bars 4 suitably mounted tooscillate within a fire-place 1, the ends 2 of which slope upwardly toan intermediate point on which is supported a ridge or bar 2a whoseupper faces incline within the plane of the slant ofthe grate bars 4.Said grate bars are trunnioned at their upper and lower ends to effectwhich said bars are proyided with trunnions 6 at their lower ends thatseat within bearings in the sides of the fire-place l, andat their upperends'said bars are recessed as' at 7 for'the reception of projections 8formed to either side of the ridge or supporting bar 2a.

The grate bars 4 are curved on their upper surfaces as shown at 4ad andare provided with a plurality of flanges 5, the spaces be tween whichprovide the draft necessary to support combustion. The upper ends of thegrate bars are centrally trunnioned so that with the circular'up'persurfaces, there is a relatively small agitation of the coal, althoughthe trunnion is not concentric with the greatest surface andl thereforethere is some agitation*suiiiciently to cause feeding of the fuel fromthe hopper. As disclosed 1n Fig. 4, the iianges on each bar are ofvarying dimensions', said flanges coperating- The further feature of theinvention and one which renders the operation of the grate .positive inits action is in having the axis of oscillation of the grate barsdisposed at a diagonal to the sides thereof, so that the fuel ingravitating, is subjected to considerable lateral displacement and,therefore, more effective treatment inasmuch as it crosses the bars inits descent, and there is also afforded by this arrangement considerable space on the agitation of the bars for the escape of the ash,clinkers, etc. i The means for oscillating the bars comprises adownwardly depending member 9 on each bar which has on its lower pointpivotal connection with a common bar 10 and that bar in turn` connectswith a pivoted lever supporting means 11 by which latter means theseveral grate bars are oscillated in unison as Will be obvious.

Along each of the upper sides of the Ereplace there is an inwardlydisposed guard plate 12 adapted to keep the fuel from overriding thefire-place.

The fuel hopper or magazine 3 is disposed above the grate bars andprecisely over the central or upper supporting ridge 2a whereby the fuelis evenly distributed upon said bar and which by reason of the peculiardisposition of the bars and their manner of operation, is caused totravel in substantially the proportions of feeding across the entiresurface of the grate.

Referring to Figs. 7 and 8 wherein is shown the application of theinvention in a modified form to a grate of the conical type, the.numerals 14 indicate the grate bars constructed substantially along thelines of those above described and which in like `manner are trunnionedat their lower ends 16 within a circularre-place 13 and at their upperends 17 within a common central conical member 18. The axis ofoscillation of the bars le isv disposed in like manner to that shown anddescribed of the foregoing ii ure whereby the supporting area of each aris varied from one endv to the other when the bars are oscillated. Themeans for actuatin this type of grate comprises a spider 18a xed withinthe fireplace and adapted to movably support a ring19 which has pivotalconnection with the members 15a depending vfrom the grate bars 14, sothat by agitation of the connecting levers 20 and 21 the several barsare oscillated on their trunnions as will be obvious.

Having thus described the invention, what we claim as new therein anddesire to secure by Letters Patent, is

1. A grate comprising a suitable support and rigid grate bars havingbearings adapting them to oscillate in said support, flanges on each ofsaid bars adapted to cooperate with the next adjacent bar and eect anopening of relativelyincreasing width bespaces between said bars,

tween the bars from the middle of said grate to either side thereof,when the grate bars are oscillated.

2. A grate comprising a suitable support and rigid grate bars havingbearings adapting them to oscillate in said support; said bearings beinglocated to fix the axis of oscillation at an angle to the sides of thegrate bar, and flanges on each grate bar cooperating with the nextadjacent bar whereby the fuel supporting area of each bar is varied fromone end to the other when the grate bars are oscillated.

3. Agrate comprising a plurality of bars having means for actuating thesame to shake the grate; a fuel feeding hopper dis* posed above andcentrally of the grate; lateral iianges having depending portions ofvarying width on each bar adapted to cooperate with the sides of thenext adjacent bar and effect an opening of decreasing width between thebars fromsaid hopper when said bars are oscillated.

1. A grate comprising a plurality of bars having means for actuatin thesame to shake the grate; a fuel feeding hopper disposed above andcentrally of the grate; lateral flanges having depending portions ofvarying width on each-bar adapted to cooperate-with the next adjacentbar when said bars are actuated and effectan opening between the bars ofincreasing width from said hopper to the outer sides of the grate.

5. A grate comprising a suitable support and grate bars having bearingsadapting them to oscillate in said support, a fuel feeding hopperdisposed above and centrally of the grate; said grate bar bearings beinglo'- cated to fix the axis of oscillation at an angle to thelongitudinal axis of said grate bars, ianges having depending portionsof varying width on each bar adapted to cooperate with the next adjacentbar when.

said bars are actuated and effect an opening between the bars ofincreasing width from said 'hopper to the outer sides of the grate.

6.. In combinationl with a grate compris- I ing a plurality of barshaving means for actuating the same to shake the grate and open meansfor feeding fuel to the pending portions of varying Width carried byeach of the bars and adapted to cooperate with the next adjacent barwhen said bars are actuated, whereby the degree of open` ing between thebars lncreases from the fuel feeding oint. l

The oregoing vspecificationsigned at Scranton, Pa., this 29th day ofMarch, 1909.

DAVID Bolas. Jos. A. WADDELL, JR.

In presence of two witnesses- J. J. BELDEN, E. A; STIMPsoN.

grate, and flanges having de-

